L4 Int surfs of bod

Question 1

mucous mem.

Answer 1

• mucous mem line cert int tubes open to ext. aliment, resp, urin tract. bear mucus sec cells var deg.
  mucous mem= epith lines lumen-CT/lp-smooth musc muc aliment.

Question 2

serous mem.

Answer 2

-thin, 2 part, line closed cavs, envelop viscera. line peritoneum, pleural sacs, pericard sac. sec lubric fluid=fric free movem organs.
serous mem= simp squam epith sec fluid- thin CT att epith to adjac tiss and carry bv and nerves.
as emb dev heart, lungs, gut next to bag cav, invag into it=surr by serous mem. outer parietal serosa, inner visceral, lubric btw.
visceral v close, cant dissec.
gut mesentery- thin strs, out and round organ then fold back.

Question 3

aliment tract inner surfs:

mucosae and wall

Answer 3

• gut wall 4 lay- mucosa, submuc, musc ext, serosa.
  mucosa=epith, lp, musc muc.
  lp cont gl, peyers.
  submuc= lay CT with gl, art, vein ,nerves. loose lay, change shape as me conract. loose irreg norm.
  me= outer longit, inner circ. both spirals of spindle shape cell. inner tight, outer relaxed. peristalsis.
  serosa= simp squam mesothel, ct beneath. ct cells not norm contig. lot extracell mater. fibrob= coll and elastin. retic fib, adipose cells, imm cells, bv’s.

Question 4

oesoph

Answer 4

• 3 lay mucosa to submuc to me. adventitia around outs, not intraperitoneal.
  oesoph mucosa= strat squam non kerat epith prev abras. lp loose ct, bv+lv, smooth musc, imm cells. mm thin smooth musc.
  submuc= subtend ct muc sec gls.
  me= 2 lay musc peristalsis.
  adventitia= thin outer ct.

Question 5

stomach.

Answer 5

• gastric mucosa sec ac, enz, gastrin. musc muc, submuc, me.
  me=3 lay smooth musc oblique, circ, longit.
  rugae= folds gastric mucosa, longit ridges in empty, not perman.

Question 6

jejunmum.

Answer 6

• most nutr abs.
  mucosa= simp col-lp-mm-sm-mm 2 lay.
  plicae circulares perman.

Question 7

large int.

Answer 7

• simp col of crypts prod muc and supp cells to surf. tubul gls. lot gob in each. surf epith abs water and eltrolyte and vitB1+K. peyers in mucosa.

Question 8

resp surfs: conducting portion nasal cav to bronchioles. resp portion bronchiole to alv.

Answer 8

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Question 9

trach wall.

Answer 9

• pseudostrat ciliated col-submuc gls-hyaline c shaped cartil-adventitia.
  cartil to bone in old. fibroelast mem conts trachealis musc.
  epith, lp, submu, cartil.

Question 10

bronchus.

Answer 10

-prim bronch compl rings cartil. pseudostart epith-musc-submuc and gl-cartil.

Question 11

bronchiole.

Answer 11

-no cartil, surr alv keep open.

simp col ciliated to cuboidal. musc. alv.

Question 12

alveoli.

Answer 12

• T1 squam 90%, sa=gas exch. t2 cub 10% prod surfactant so stay open. lot macroph line alv surf. erythroc less than 1 sec in alv capill. capill simp squam endoth. 0.2um btw. alv surr by basket capill and least fib not contin, recoil on exhal.

Question 13

urin tract inner surfs.

Answer 13

-

Question 14

ureter.

Answer 14

• transit epith- fibroblast lp- circ musc ext.

Question 15

bladd wall.

Answer 15

• TE- smooth musc lp- musc ext 3 intercal lay.

imperm to urine by thick pm and intercell tight juncs.

Question 16

urethra.

Answer 16

-stellate urethral lumen becomes ovoid when pass urine.
te- lp- me longit and circ- adventitia.
male urethra 220cm, fem 3/4.
penile urethra- strat col. erectile tiss of corpus spongiosum with vasc sinusoids.

Question 17

LO1: desc struc rel btw epith and assoc tiss (gl, lp. musc muc) comprising GI, GU, resp mucosae.
LO2: how GI, GU, resp mucosae struc of constit tiss rel to func.

Answer 17

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